Safety device for punch presses or the like



April 14, 1931. A. R. HOMER SAFETY DEVICE FOR PRESSES .OR THE LIKE Filed Sept. v, 1928 2 Sheets-Sheet 1 I N V EN TOR.

A T TORNE Y.

April 19314" A? 'R'HQMER SAFETY DEVICE FOR PUNCH PIRESSES OR THE/LIKEFiled Sept 7, 1928 .2 Sheets-Sheet 2 'INVENTOR. fi/Z/Tf Ffi men '4 tATTORNEY.

Patented A r. 14, 1931 K fire!) star ALBERT R.

a" it" r'i POB'ATION, 01 DETROIT, MICHIGAN, A UOElPORiTION OEIOElli-LVJA-i.RE

' SAFETY DEVICE non PUNCH ranssns on' rnn LIKE.

Application filed September 7, 1928. Serial No. 304,480.

This invention relates to a safety device for punch presses or the like,which is arranged tosweep the arms and hands of an operator out of theway of the press when the same is operating.

- The invention sion of animproved safety device be easily attached toany press,

has as an object the proviwhich can and which while involving a simplestructure, is one Which possesses a positive and rehable operation forpushing the arms of the operator outfrom under the rams of the press.

in the accompanying drawings:

Fig.1 is afront elevational view of a press with the improved safetydevice or" this invention attached thereto.

Fig. 2 is a sideelevation of the same.

Fig. 3 is a detail of some of the operable connections, taken on line3-8 of Fig. 1.

Fig. 4 is a detail view, partly in section, illustrating the manner inwhich the sweeping arms are attached to the supporting arms therefor.

Fig. 5 is a section taken on line 5-5 of Fig. 4. r

Fig. 6 is a detail View illustrating the arrangement of mechanism.

in these drawings a punch press is shown as consisting of a base plate1, a ram 2 which is operated by a suitable crank 3 through a base plateand. rain will have suitable dies, punches or the likev associatedtherewith in the usual manner.-

The arm sweeping devices take the form of a pair of arms ,4: suitablyshaped as shown which may be provided each with a rubber sleeve 5. Thereare two rocker arms 6 which are pivoted each at 7 to a stationary partof the press, as by means of suitable plate 8.

With reference to Fig. 4 it will be observed that each rocker arm 6 isprovided with a groovelO in which is arranged to fit one sweeping arm4t. There is a bolt hole 11 through the rocker arm which cuts throughthe arm at the point of the groove. A bolt 12 extends through the bolthole '11, and the same is provided with an aperture through. which thearm 4. extends, as illustrated in Fig. 5. When the nut on the end of thebolt pitman 3a. The

,lengthwise'in the, groove when the, nut on the sweeping arm operatingnature shown,

arm l is clamped against the groove and held from sliding movementtherein. From this construction it will be seen that the arm 4 cannottwistas re.- "ards the rocker-arm 6 by reason of being 23 lOCkQCllllthe, groove, and that 1t cannot slide 12 is tightenedthe the bolt istightened. However, when the nut on thebolt is loosened the arm is freeto slide in the opening through the bolt 12 for adjustment purposes. I I

Each arm 6 is provided with asleeve 15- slidably connected toacross'bolt 16 (Fig. 6). This cross bolt is carried by a head 17 which isconnectedto an operating arm '18. The manner oi" connection.isillustrated in Fig.- 3 and consists of a bolt 19 which connects thetwo parts together with pins/2O and cooperating apertures 21. This sortof a connec tion prevents relative turning movement of the arm and head.

The opposite end of arm 18 is connected to a moving part of the press,purpose the pitman 3amay be employed. The connection with the pitmanadvantageously takes the form ofan eye bolt 22 having cross pin. 23 towhich a link 24 is pivoted. This and for this I link is in turnpivotally connected with the 7 arm 18, as shown at 25. ,In theroperationof isreciprocated in accordance with the movements of the pitman andthisefiects rocking of the arms 6 to and from the full and dottedlinepositions shown in Fig.1. In this movement the arm sweeps i move to andtr om the full and dotted line positions; When the ram. of the press isin uppermost position the guard device parts take'the position shown indotted lines with the sweeping arms in close proximity and positionedcentrally of the working side of the press. When; the ram comes downthesweeplngarms move to the position illustrated in full lines.

There are times when it ,is necessary to make certain adjustments in thepress of'the amongwhich is an adjust-. ment to give proper height to theram, and it is necessary to have free access to the press mechanism for7 this purpose. Accordingly, the arm-1 8 may be disconnected from thethe press, the-rod 18 head 17 by removing the bolt 19 whereupon the samecan be swung out of the way on its pivotal connection with the link 25.The link 25 in effect establishes a universal j oint between the pitmanand the rod 18 so that the rod can be moved to any position out of theway.

Each time the ram comes down the sweeping arms 14 move outwardly fromtheir central position thus sweeping the hands and arms of the operatorout of the way. This is especially advantageous where the ram makes anunexpected repeat operation.

.lVhen the ram is raised the sweep arms are in close proximity next thecenter line of the working side 01 the press and offer very littleinculnbrance to the operator. The struc ture as a whole is of simpleconstruction and one which can be applied to any press withzoutrequiring modification of the press in any way. Moreover, it has aminimum number of'working parts, and indeed, there are no parts whichare subject to wear such as would interfere with the operation of theguard device.

At the point where the arm 18 is connected to the pitman there will notbe a straight reciprocating movement but there will be a circularmovement corresponding 'to the movement of the crank. This movement is'taken care of inasmuch as the head 17 may rock relative to the arms 6 byreason of the connection established bythec'ros's rod 16.

Claims:

1. A safety devicetor a punch press or the like, comprising a pair ofsweep arms, a pair of oppositely disposed rocker arms pivoted to a fixedpart of the press, said sweep arms being connected respectively to therocker arms, a cross rod slidably connected with the ends-of the rockerarms, and an operable connection between said cross rod and a movableart of the oress the swee 3 arms and ress arm connected to the cross rodand a moving part ofthe press, whereby upon operation of the press therocker arms are moved to actuate the sweep arms, said sweep arms beingarranged to sweep'the hands and arms of the operator out of the way ofthe press, the coin nection between the operating arm and said cross rodbeing detachable to permit 01" access to the press for adjustingpurposes.

3. Asafety device for a punch press or the like, comprising a pair ofsweep arms, means movably mounting the sweep arms, each adjacent 'a sideof the press, said press ineluding a crank with a connecting rod there:on for moving the ram, a rod operatively connect-ed to the means for Imounting the sweep arms, and a universal joint connection between oneend of the rod and a part of the press operating connecting rod. 7

4;. A safety device for a punch press or the like, comprising a pair ofsweep arms, means movably mounting the sweep arms, each adjacent a sideof the press, said press including a crank with a connecting rod thereon for moving the ram, a rod operatively connected to the means for"mounting the sweep arms, and universal joint connection between one endof the rod and a part of the press operating connecting rod, theconnection between the rod and the said means for mounting the'sweeparms being detachable to permit the rod to be moved'for press adjustingpurposes. V

In testimony whereof I aflix my signature.

ALBERT R. HOMER.

